[QUESTION] turn specific pixel on or off?

[othmar52]

Hi, Currently i try to build a speedometer for a table soccer that has 8 light barriers per goal

i use displayZoneText() with PA_NO_EFFECT
For calibration purposes i'd like to switch a specific pixel for each light barrier on or off to reflect its state.

is this posible with the MD_Parola library without using custom characters?
the code for those custom characters would be a huge mess because of permutation of all possible states of the 16 light barriers

pseudo code

// render the text in all zones
// as we dont use an effect it renders immediatly
Display.displayAnimate();

// render the state of each light barrier
if (lightBarrier8 == HIGH) {
  Display.turnPixelOff(x8, y8);
} else {
  Display.turnPixelOn(x8, y8);
}

thank you

[MajicDesigns]

Just use the MD_MAX72xx library setPoint() directly to turn on the pixels.

If you are doing this as a once off testing code, just use MD_MAX72xx. If you are using it in your code always then you get the MD_MAX72xx library pointer used by MD_Parola using the getGraphicObject() method.

[othmar52]

thank you for your fast help!
in case there are some other arduino noobs like me out there

MD_Parola Display = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
MD_MAX72XX *pM;

  // use setPoint() to turn on/off a specific pixel
  pM = Display.getGraphicObject();
  pM->setPoint(5, 0, true);